Hi Vishwa,
the only way I can help you is giving you my code of initialization:
Try to adapt it for non your platform.
variables of instance:
osg::ref_ptr<osgViewer::Viewer> _viewer;
osg::ref_ptr<osg::MatrixTransform> _root;
- (osg::ref_ptr<osg::GraphicsContext>)createGraphicContext
{
//create our graphics context directly so we can pass our own window
osg::ref_ptr<osg::GraphicsContext::Traits> traits = new
osg::GraphicsContext::Traits;
// probably you need to change this because it is for iOS
osg::ref_ptr<osg::Referenced> windata = new
osgViewer::GraphicsWindowIOS::WindowData(self.view,
osgViewer::GraphicsWindowIOS::WindowData::IGNORE_ORIENTATION);
// Setup the traits parameters
traits->x = 0;
traits->y = 0;
traits->width = //put here the width of the window view
traits->height = //put here the height of the window view
traits->depth = 24; //keep memory down, you can put 16
traits->windowDecoration = false;
traits->alpha = 1;
traits->doubleBuffer = true;
traits->sharedContext = 0;
traits->setInheritedWindowPixelFormat = true;
//traits->windowName = "osgViewer";
traits->inheritedWindowData = windata;
// Create the Graphics Context
osg::ref_ptr<osg::GraphicsContext> graphicsContext =
osg::GraphicsContext::createGraphicsContext(traits.get());
osg::setNotifyLevel(osg::INFO);
return graphicsContext;
}
This is the function that initialize everything:
//here I call the function I previously defined to create graphics context
osg::ref_ptr<osg::GraphicsContext> graphicsContext = [self
createGraphicContext];
//create the viewer
_viewer = new osgViewer::Viewer();
//if the context was created correctly then attach to our viewer
if(graphicsContext)
{
//suppress annoying opengl warnings //attention please, you can comment
the lines to debug
graphicsContext->getState()->setCheckForGLErrors(osg::State::NEVER_CHECK_GL_ERRORS);
_viewer->getCamera()->setGraphicsContext(graphicsContext);
_viewer->getCamera()->setViewport(new osg::Viewport(0, 0,
graphicsContext->getTraits()->width, graphicsContext->getTraits()->height));
}
else
{
std::cout << "ERROR: I can't create graphic context" <<std::endl;
}
//create root of the scenegraph tree
_root = new osg::MatrixTransform();
//what I do here is simply create new nodes representing what i want to
draw and add them as child of _root
[self initModels];
//YOU PROBABLY DON'T NEED TO DO THIS part about shaders
std::cout << "initing shaders" <<std::endl;
//initialize the shaders and attach them to _root
[self initShaders];
std::cout << "setting scene data to root" <<std::endl;
//create scene and attach it to _viewer
_viewer->setSceneData(_root.get());
//Set the threading model for the viewer,
//Possible options are: SingleThreaded || DrawThreadPerContext
_viewer->setThreadingModel(osgViewer::Viewer::SingleThreaded);
std::cout << "setup camera" <<std::endl;
//I setup the camera parameters such as clear color, clear mask, render
order ...
[self setupCamera];
_viewer->frame();
Then you call back _viewer->frame in a way I think you know.
The function [self setupCamera] is this:
- (void)setupCamera
{
//set the clear color of the camera to be semitransparent
_viewer->getCamera()->setClearColor(osg::Vec4(0.0f, 0.0f, 0.0f, 0.75f));
//set the clear mask for the camera
_viewer->getCamera()->setClearMask(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
_viewer->getCamera()->setRenderOrder(osg::CameraNode::PRE_RENDER);
_viewer->getCamera()->setComputeNearFarMode(osgUtil::CullVisitor::DO_NOT_COMPUTE_NEAR_FAR);
}
I personally tried the semi-transparency (with that value of 0.75) and it is
working.
I hope this helps.
Just remember to attach a Camera manipulator or manually set ViewMatrix and
ProjectionMatrix
Cheers,
John
On Jun 6, 2012, at 10:58 AM, Robert Osfield wrote:
> Hi Vishwa,
>
> On 6 June 2012 05:46, shekhar vishwa <[email protected]> wrote:
>> I am trying to implement the multiple views in same window. Each view render
>> the diffrent models.User can set the view position at run time by mouse
>> dragging. If dragged view is overlapped with any view then dragged view
>> backgroud should be semi-trasparent.
>>
>> Please suggest me to resolve this.
>
> When you say background of the view being moved do you simply mean the
> clear colour that provides the normal background colour of a viewport
> needs to be disabled? This is an important point as there isn't
> really any concept of "background" in OpenGL or the OSG. Also be
> specific about what you mean by semi-transparent. I'm guessing that
> you want to see the underlying views being the viewport, but what
> blending do you intend between the view at the front and the back?
>
> Robert.
> _______________________________________________
> osg-users mailing list
> [email protected]
> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
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